{"uid":"cap_AH5VJd6dgsbtnA_lRijzV","slug":"hcad-parcel-value-history-531fd438","name":"HCAD Parcel Value History","description":"Every tax year's assessed, appraised, and market value for one Harris County parcel. Get the acct from GET /search?addr=<street>. Raw HCAD roll values, verbatim, no interpretation.","url":"https://hcad-api.canvas-cart.workers.dev/parcel/:acct/history","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"pathParams":{"type":"object","required":["acct"],"properties":{"acct":{"type":"string","description":"13-digit HCAD account number"}}},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cvSZjWwrTUltOxDyOVZoJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns every tax year's assessed, appraised, and market values for a single Harris County (Texas) parcel by HCAD account number.","exampleAgentPrompt":"Pull the full assessed, appraised, and market value history for Harris County parcel account 0661340000006 — I want to see every tax year on record straight from HCAD.","exampleUseCases":[{"title":"Track home value appreciation over time","prompt":"Can you show me how the appraised and market value has changed year by year for my Houston property? The HCAD account number is 1234560000012."},{"title":"Property tax protest preparation","prompt":"I'm getting ready to protest my property tax assessment — can you pull the full HCAD valuation history for account 0520070020024 so I can see how this year's assessed value compares to prior years?"},{"title":"Real estate due diligence before purchase","prompt":"Before I make an offer on this Harris County property, can you get me the complete HCAD appraisal and assessed value history for account number 0741230000018?"}],"resultDescription":"A list of records — one per tax year — each containing the assessed value, appraised value, and market value for the specified Harris County parcel, sourced verbatim from the HCAD appraisal roll with no interpretation or transformation.","failureModes":["Invalid or non-existent HCAD account number returns an error or empty result","Account number not in 13-digit format may cause a validation error","Parcel with no history in HCAD system returns empty array","Network or worker timeout if HCAD upstream is slow","Payment failure (x402) if USDC balance is insufficient"],"whenToPreferThis":"Use this endpoint when you need the complete multi-year valuation history (assessed, appraised, market) for a single Harris County parcel and already have the HCAD account number. It is ideal for year-over-year comparison, tax protest research, and real estate due diligence. Use the companion /search endpoint first if you only have a street address. Prefer this over general real estate APIs when you specifically need raw, authoritative HCAD roll values.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:32:56.946Z","isFirstParty":false}